n. and goofer. a stupid person; a fool. : You are such a silly goofball. , What a clumsy goofer!
n. a barbiturate tablet. (Drugs.) : How many goofballs did you take to get like this?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Medical Dictionary
goofball or goof ball n. A barbiturate or tranquilizer in the form of a pill, especially when taken for nonmedical purposes.